Synthesis of picramide using nitration and ammonolysis in continuous flow

    • Ankit Kumar Mittala
    • Gaurav Prakasha
    • Pramod Pathaka
    • Debabrata Maitia
    • aIndian Institute of Technology Bombay, Chemistry, INDIA

    This paper describes a safer, scalable and continuous process for synthesis of picramide. The process consists of two steps: step-1. nitration of p-nitroanisole (PNAN) to 2,4,6-trinitrianisole (TNAN); step-2. ammonolysis of TNAN to picramide. Both the steps were optimized in flow, with yield of 90% and 98% in step-1 and step-2 respectively. Picramide with HPLC purity greater than 99% was obtained. When compared with batch, in step-1, flow process provided significant advantage in selectivity and yield. The optimized flow process was scaled to 25 g/hr production rate in a laboratory flow reactor. The method can be considered fit for the safe production of picramide at commercial scale.

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